Putting together a S100 backplane at the very minimum requires hard to find edge card connectors. 0.125" pitch is no longer in common usage. The N8VEM V4 backplane uses a LM4250 op amp which is obsolete. Zilog still produces the Z80, but that's the only CPU that I know still in production. Legacy boards have "who knows what" on them. S100 computers will be an exercise in second market, small electronic shops, eBay and New Old Stock (NOS).
Here is my experiences chasing down three parts, the edge card connector, the LM4250 and a SII164CTG64.
